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Pollen is one of many types of cloud condensation nuclei (CCN). So can you make clouds without pollen? Yes, but you still need other sources of CC. Don’t fall into the false dilemma that pollen is a requirement for cloud formation. The more soluble the CCN is, the easier it is to form a cloud (see Koehler theory). Can a cloud be formed without CCN? I saw it ...


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Yes, the higher floors will have less pollution than the street level. The wind rises as a function of altitude, so the street will have less new air coming in, on average: Some of the pollutants are lighter than air, i.e. Ozone, and some are heavier, i.e. particulate matter, they tend to rise or fall very slowly, so they can be slightly different gradients ...


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